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The Portal was a paranormal doorway that led to the Divide and from there the World of the Dead. The location of the portal was The Mercado Hotel's basement, which was where two Ley Lines met. The barrier was opened up by the Barrier Compromising Master Machine with the aid of the energy charged by Hyper-Ionization Devices created by Rowan North. After Rowan successfully opened the portal, it released a army of ghosts during the ghost invasion. The Ghostbusters stepped into the lobby of the Mercado Hotel. The portal was in the center of the lobby. After Rowan took on a giant ghost form, Abby Yates prioritized the need to reverse the portal but it required an insane amount of energy.[2][3]Erin Gilbert wondered what to do. Abby believed they just had to shoot directly in the portal with more power to cause a reverse reaction. Jillian Holtzmann suggested they cross the streams.[4] Erin remembered that was the thing that was so powerful that would make all of their atoms implode. Holtzmann corrected her and thought it would be more violent than that. Abby believed they had an extremely good shot at pulling all the ionized ecto-matter back into the dimension of its origin by crossing their streams into the portal.[5] Erin saw the pro was they saved the world but the con was they experienced the most painful death conceivable of all time. Abby admitted it was hard to shine that penny. Erin agreed to do it.

They returned to the portal and crossed the streams into it. The Ghostbusters fell on their backs from the recoil. Abby realized the portal was too strong and they didn't have enough power to reverse it.[6] The Party Specters in Ecto-1 approached the Mercado again. Patty Tolan asked about the roof rack equipment. Holtzmann theorized if they could get the reactors super-critical inside the vortex, the beta radiation could reverse the polarity.[7] Erin realized it would cause a total protonic reversal.[8] Abby equated the plan to turning the portal into a giant ghost trap and called Patty a genius.[9] Patty stated she was a Ghostbuster. Abby told everyone to focus on narrowing the car's path. They blasted one pole at time. Ecto-1 swerved away from each one. "End Of The World (Party One More Time)" played in Ecto-1. Holtzmann directed them to aim for the silver canisters. They side stepped Ecto-1 and fired. Ecto-1 launched in mid-air into the portal. They nailed the canisters as it descended into the Portal. The Portal turned from green to red. The Slimers were launched into the air, still seated on the front seat cushion. Both laughed then were pulled back in the portal. All the ghosts around the city were pulled in by red streams of energy shooting out of the Portal. Erin exclaimed it was working. Even Rowan was pulled back but he resisted and held onto some buildings. Erin didn't want to let the portal close with him still in New York. Abby ordered everyone to loosen his grip. They shot his "crotch." He winced and clutched his "crotch." Patty asked if that was where she wanted them to shoot. Rowan tripped on a fire truck as he was pulled forward. Rowan reached for the Ghostbusters as he fell to the ground. Abby told them to look out. She pushed Patty aside. Rowan grabbed Abby as he was pulled into the portal. Erin tied a winch from a nearby firetruck around her waist and jumped in. After getting Abby, they both were pulled back in by Holtzmann and Patty. After Erin and Abby returned, the portal sealed back up. The Mercado Hotel was restored back to normal and day returned.

The vortex above the Mercado is inspired by "Close Encounters of the Third Kind" and the 1984 version of "Ghostbusters."[10]

Most filming for the location was done on a sound stage.

On September 8, 2015, it was reported in June that land was leased Columbia and as early as July 27, a crew built a set on a runway left over from SouthField's previous life as the South Weymouth Naval Air Station. An old 32,000-square-foot aircraft hangar was also be used. It was used for a green-screen stage and special effects photography during Boston filming.[11]

The Mercado lobby was featured in the movie's first press photo, released on December 16, 2015.[12]

↑fxguide "Who you gonna call? Call Illoura, MPC, SPI, & Zero VFX" 8/10/16Line reads: "From the start of the project the director, Paul Feig, was interested in having the ghost cloud that forms above the Mercado Hotel looking similar to classic cloud tank effects. We spent a great deal of time looking at classic films such as Close Encounters of the Third Kind and the 1984 version of Ghostbusters. In the end we used Flowline to generate a highly customized vortex motion and did the final volumetric render in Renderman."